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Blue Lagoon Copper 3 in 1 is the world's first test strip to measure values for copper disinfection (for both, liquid and granulate, copper sulphate pentahydrate and copper ionization systems). Combined with a pH and total alkalinity (KH) test! Procedure: Dip one teststrip ± 5 seconds in your swimming pool water and move it gently back and forth. Remove the strip and shake it once powerfull to get rid of the excess water. Wait for 15 seconds for the colors to appear. Compare the colors with the colormap on the packaging in 30 seconds for the best result. Measuring range: Copper: 0, 0.2, 0.4, 0.6, 0.8, 1, 2 ppm pH: 6.0, 6.4, 6.8, 7.2, 7.6, 8.2, 9.0 Total Alkalinity: 0, 40, 80, 120, 180, 240,360 ppm